NO- 3573 COPEPODS — HUMES AND HO H 



and greatest width 0.32 mm (0.27-0.37 mm), based on 8 specimens. 



Ratio of length to width of prosome 1.65:1. Segment bearing leg 1 



completely fused with head. Lateral areas of segments of legs 1^3 



not produced ; those of segment of leg 4 slightly angular posteriorly. 



Segment of leg 5 (fig. 38) broad, 94m x 242/i, with fifth legs borne 



posterolaterally. Between this segment and genital segment on 



ventral side a weak intersegmental sclerite. Genital segment 



(fig. 38) wider than long, 130m x 198m. In ventral view its lateral 



border (fig. 39) with a small notch near middle of segment and a 



more pronounced indentation posteriorly. Areas of attachment of 



egg sacs situated dorsolaterally in midregion of segment. Each 



area (fig. 40) bearing outwardly a rather hyaline flange and inwardly 



a slender seta 11m long, a spiniform seta 8m long, and 2 small spinous 



processes. On ventral surface of posterior half of genital segment a 



transverse row of prominent spinules. Three postgenital segments 



78m X 135m, 60m x 118m, and 91m x 91m, respectively, from anterior to 



posterior. Anal segment (fig. 41) bearing anteriorly 4 transverse rows 



of spinules, 2 rows ventrolateral and 2 ventral; along its posterior 



border near insertion of each caudal ramus a row of small spinules, 



this row continued on dorsal side. 



Caudal ramus (fig. 42) 104m x 34m, or 3 tunes longer than wide. 

 Minute basal outer spinule 3m long. Outer lateral seta 22m long and 

 naked. Outermost terminal seta 41m long, naked, and composed of 

 2 parts: a sclerotized proximal half and a more slender distal portion. 

 Innermost terminal seta 57m long and haired along inner side. Two 

 long terminal setae 209m (outer) and 462m (inner), both basally 

 "pegged" and bearing lateral spinules. Pedicellate dorsal seta 

 39m long and naked. Dorsal surface of ramus with small hairs and 

 refractile points as indicated in figure. 



Dorsal surface of prosome and dorsal and ventral sm-faces of 

 urosome with scattered refractile points and hairs. Prosome slightly 

 longer than urosome, ratio 1.1:1. 



In single ovigerous female collected egg sac (fig. 43) 319m x 107m, 

 extending a little beyond ends of caudal rami, Avith each egg about 40m 

 in diameter. 



Rostral area (fig. 44) small and well sclerotized. Posterior to it, 

 between bases of second antennae, a small circidar sclerotization! 

 First antenna (fig. 45) 6-segmented and relatively short and robust, 

 Its length about 143m. Lengths of segments measured along their 

 posterior nonsetiferous margins: 15m (39m along anterior margin), 

 19m, 28m, 18m, 13m, and 24m, respectively. First segment with 5 setae, 

 proximal one lightly haired, distal one spiniform, with a row of 

 scaldike spinules along one edge. On second segment 2 similar 

 spiniform setae. All remaining setae naked. Each of last 3 seg- 



